Hot-air furnace



May 25 1926.

F. H. CARSON HOT AIR FURNACB Filed July 3Q. 1925 4 Sheets-Sheet 1 .F.ML

May 2s 1926. 1,586,407

F. H- C ARSON HOT AIR FURNGE nvewtoz Mayzs 192e. 1,586,407

F. H. CARSON HOT AIR FURNACE Fi-1ed July 30. 1925 4 Sheets-Sheet :5

May 25,1926-, 1,586,407

F. H. CARSON HOT AIR FURNACE l Filed July 30.. 1925 4 Sheets-Sheet 4 Patented May 25, 1926.

rnaNx H. cansoN, or LANSING, ILLINOIS.

Hor-AIR rUnNacE.

Application led July 30, 1925. Serial No. 47,114.

This invention relates to certain new and useful improvements in hot air furnaces, and has more particular reference to a furnace of this kind embodying a vertical fuel l magazine.

The primary object of the mventlon .1s to generally simplify and improve hot air furnaces of the above kind whereby the same will be extreme] simple and durable l in construction as wel` as efficient in operation.

Another object is to so construct a hot air furnaceas to embody means for permitting and insuring complete combustion of the fuel 1l under various conditions of use and in such manner as to obtain the greatest possible heating efficiency.

Other objects will appear as the nature of i the invention is better understood, and-the 2 same consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed.

In the drawings, wherein like reference characters indicate corresponding parts throughout the several views,

Figure 1 is a front elevational view, partly broken away and in section, of a hotair furnace constructed in accordance with the present invention, l

Fi ure 2 is an enlarged fragmentary horizontr section taken substantially upon line 2 2 of Figure 1,

Figure 3 is a developed perspective view illustrating one of the devices for securing `the removable casing section of the furnace in place,

Figure 4 is a substantially central Vert-ical sectional view ofthe furnace shown in Figure 1,

Figure 5 is a vertical sectional view taken substantially upon line 5-5 of Figure 4,

Figure 6 is ahorizontal section taken substantially upon line -6-6 of Figure 4,

Figure 7 -1s a horizontal section taken substantially upon line 7-7 of Figure 4, Figure 8 is a view similar to Figure 7, taken upon line 8-8 of Figure 4,

Figure 9 is a view similar toFlgure 8 taken on a horizontalo plane somewhat below 4 the section linev 8-8, and n 10 is a 'verticalsection taken sub stantially upon line 10-10 of Figure 9.

the form o the invention herein illustrated grate structure embodies a ring 9 provided Referrin more in detail to the drawings,

consists of a flat or horizontal hollow base 5 forming an ash pit and provided with a door 6 for facilitating removal of the ashes therefrom. The base 5 has a central opening in its top Wall and is formed with an upstanding fire pot 7 in surrounding relation to this opening, the fire pot being also equipped with avfront door 8 to permit poking of the fuel should the same be found necessary.

As shown more clearly in Fi res 9 and 10, a grate structure is supporterlby the top wall of the base 5 and is arranged lwithin the centr-al opening in the latter. This at its top edfge with horizontal outwardly projecting ra ial lugs'lO which seat in suitable radial grooves or sockets formed inthe top Vwall of the base 5 and indicated atv 11 in Figure 10. The ring 9 is thus restrainedfrom rotation relative to the base 5 although capable of being removed from the latter, and projecting inwardly from the lower edge of the ring' 9 is a horizontal annular ange 12, the upper surface of which is formed with radial teeth as shown clearly in Figure 9 so as to constitute a horizontal gear. The grate proper embodies a pair of concentric rings 13 and 14 between which are disposed a circular series of radiall extending grate bars 15 that are securedy upon shafts 16 whose end portions are journaled in the rings 13 and 14. The shafts 16 project outwardly through the outer ring 13 where they are provided with pinions 17 that mesh with the gear 132, and it will thus be seen that when the grate proper is given a rotary reciprocating movement, the grate bars will be given a shaking movement as well as an axial turning or dumping movement. In other words, the grate bars l5 will be recip- `rocated in an arcuate path and by reason of the fact that the pinions 13 mesh with the stationary gear 12, said grate bars will also be given a rotary reciprocating movement bodily about their radial axes or with their shafts 16 on which the pinions 17 are fastened."A This provides a very eicient grate structure b means of which all completely consumed uel may be caused -to pass into the ash pit.

An outer drum 18 is pivotally` arranged above the fire pot 7 and has its lower edge portion seated within a groove or flange on 'no the upper edge of said lire pot as shownclearly in Figure 4, and disposed within and in spaced concentric relation to the outer drum 18 is a second or inner drum 19 within and in spaced concentric relation to which is disposed av central vertical fuel magazine 20 preferably of the tapered form shown. The lower edges of the drum 19 and magazine 20 are disposed slightly above the upper edge of the fire pot 7 and are rigid with an annular horizontal tube 21 which closes the space between the lower ends of the drum 19 and magazine 20 and has a series of openings therethrough on its under side as indicated at 22. f The space between the inner drum 19 and magazine 20 is open at the top of said drum 19 with the exception of points where these parts are rigidly connected by radial webs 23 as shown in Figures 4 and 7, and formed on the upper edge of the inner drum 19 is an outwardly projecting annular iangeof angular cross section as indicated at 24, the depending free edge portion of the flange 24 being seated in a groove of annular form provided in the edge portion of an inwardly and upwardly tapering fla-nge 25 provided on the upper edge of the outer drum 18. The flange 25 may be ixed to the drum 18 after the drum 19 and magazine 20 are positioned in place, and it will thus be seen that the structure embodying the rigidly connected drum 19 and magazine 20 is effectively supported so v that the parts are disposed as shown in Figure 4 with the tube 22 disposed above .the fire pot 7 and adjacent the side wall of the latter. j It-'is also obvious that a packing may be provided at the joint between the flanges 24 and 25 so that the space between thel drums 18 and 19 is effectively closed at the top of the latter- The fire spot 7 is provided with an eX- ternal annular hollow band 26 which is horizontally disposed between the top and bottom edges of the fire pot and which is provided with an inlet opening 27, the .fire pot 7 being formed with a horizontal series of openings 28 which communicate with the interior of the band 26 so that air may pass from within said band intol the fire pot entirely around the latter. A tube 29 extends from the outside of the outer drum 18 to and communicates with the tube 21 so that air may be suppliedto the latter for ultimately passing outwardlly and downwardly through the outlet openings 22 toward the fire pot and the openings 28 of the latter. The admission of air to the tube 29 and band 26 may be controlled by a suitable dam er 30 associated with .the inlet opening 2P? and the outer end of the tube 29, the arrangement being such as te permit simultaneous passage of air to these parts, or not, as desired.

i The magazine 20 projects a considerable distance above the tops of the drums 18 and 19, and communicating at their upper ends with the interior of this upper projecting portion of the magazine 20 are vertical tubes or pipes 31 whose lower ends communicate with opposite sides of the base or ash pit 5. A plurality of spaced horizontal tubes 32 connect the drums 18 and 19 and provide means for supplying air from the exterior of the outer drum 18 to the interior of the inner drum 19 or the space between said drum 19 and the magazine 20. It will thus be seen that the air will pass into the lower part of the space or chamber within the drum 19 and around the magazine 20 and then will pass upwardly to be heated, such heated air ultimately passing out of the upper end of the inner drum 19 and into the space provided within the top of a casing 33 which surrounds the drum 18, iire pot 7 and ash pit 5 and is in spaced relation to said drum 18 as shown clearly in Figure 4. The top of the casing 33 is provided with a plurality of hot airoutlet pipes 34 by means of which the heated air may be conducted to the various rooms of a dwelling or the like. Arranged within the casing 33 in surrounding relation to the magazine 20 and above the .upper end of the outer drum 18 isa horizontal annular tube 35 which has depending nipples 36 telescoped onto upstanding nipples provided on the flange 25, whereby products of combustion may pass from the space between the drums 18 and 19 into the pipe 35. The pipe 35 is further connected to a smoke pipe 37 and the latter extends rearwardly through the casing 33 and may be connected in any well known or preferred manner with the chimney of the building in which the furnace is. employed'. A suitable handle 38 may be attached at its inner end to the grate ring 14 for facilitating shaking of the grate, the outer end of the handle 38 being projected through a horizontal elongated slot as at 39 provided in the casing 33 as shown best in Figure 1. The magazine 2O is preferably provided with a removable cover 40 for facilitating introduction of the fuel, and the upper end ortion of the magazine 2O projects upwar ly-through a central opening in the top wall of the caslng 33 for facilitating access to the cover 40.

A pipe or tube 41 has its iends secured 1n openings in the drum 18 and magazine 20 and extends through an opening in the drum 19, and this pipe 41 provides means for permitting entrance of air from the outside of the outer drum 18 to the interior of the magazine,20 directly above a fire built in the furnace. A damper 42 is provided at the outer end of the pipe 41 so as to control the amount of air admitted.

The casing, 33 is preferably constructed of inner and outer sheet metal walls 33 and 34 arranged in spaced relation, the space between the walls being lled by asbestos sheets 45.

The casing 33 peferably embodies a removable section 'of any desired size and 'generally indicated by the reference character S This removable section is preferably tapered along its vertical edges to provide V-shaped tongues, and the adjacent vertical edges of the body of the casing 33 are formed to provide V-shaped groovesy in which these tongues are adapted to be ,snugly fitted as generally indicated at 46.

adapted to align with tlre eyes 48 for re-` movable reception of a wedge 5l whereby the members 47 and 49 may be separably connected with the adjacent edge portions of the furnace -body and its removable section drawn tightly together. The member 49 preferably consists of a strip of metal return bent so as to have the eye 50 formed at its intermediate portion. It will thus" be seen that when the members 47 are Secured to the bodyof the casing 33 and the members 49 secured tothe removable section S, the latter may be firmly held in place with the meeti-v edges of the casing body and its remova'bnfe section in air tight relation. By removing the wedges 51 the sectionS may be readily removed for permitting access to the parts within the casing when their renewal or repair is found necessary. The casing 33 is provided with a relatively large door 52 which may be opened for permitting access to the doors 6 and 8, and extending through a side of the casing 33 is a cold air pipe 53 whose inner end communicates with the interior of the casing 33 at one side of thelatter and as best shown in Figures 1, 4 and 6. The pipe 53supplies cold air to the furnace and particularly to the space between thel casi 33 and the outer drum 18 at the bottom of said space so that air will be sup lied for passing into the space between t eA inner drum 19 and the magazine 20 through the pipes 32.

idloor is to be placed l' YThe pipe 53 is provided with a side open# ing closed by means of a door 54, land arranged within the pi v53 adjacent the an air moistemng and cleaning device consisting of a water pan 55 adapted openngof thedoor 54 so as to rest upon Vspace above the drums within into the pipe 4through the door the bottom wall of said pipe 53 as shown in Figure 4. A screen 56 extends across the interior of the ypipe 53 so that all air passing through the pipe 53 will have to pass through this screen for being cleaned,and supported by the screen 56 are a plurality of which 57 whose lower ends project into the water within the pan 55 so as to be kept saturated for moistening the air coming in contact therewith in its passage from the pipe .53 to the furnace.

In operation the fire is built upon the grate within the lire pot, and air is admitted through the openings 27 and 28 from the annular ktube 22 and the belt 26 when the damper 30 is opened for admitting air to the tube"22 and belt 26. The yair passes outwardly throu'gh the openings 27 and 28 ino posed jets, thus effectively promoting comllustion ol the fuel evenly on all sides or entirely about the fire pot. The uncon.-

sumed gases will pass into the upper ends of the pipes or tubes 31 and then downwardly through the latter into the ash pit 5 for being ultimately allowed to rise 'through the fuel and there consumed.

Further and more complete combustion may be had by admitting air through the pipe or tube 41 by opening the damper 42, the latter air mixing with the unconsumed gases referred to above. The products-of combustion will also be drawn from all sides of the fire pot upwardly into the space be? tween the drums 18 and 19, to ultimately pass into thevhorizontal circular or annular tube 35 and then through the smoke pipe 37 so as to pass from the latter to the chimne .By allowin'g part of the products of com ustion to be drawn into the tube 35 from alla sides ofy the fire pot by the chimney draft, even combustion of the fuel inthe fire pot is insured. The air entering the tubes 32 -and passing therefrom upward ly in the space between the inner drum 19 and magazine 20 will be effectively heated and wil rise in a heated column into the the top of the casing 33, from whence it will be led to the desired pipes 34. Any suitable means may be provided for permitting control of the dampers 32 and 30 from the exterior of the casing Fom the foregoing description it is believed that the construction and operation as well as the advant es. of the present invention will be readily understood and ap reciated by those skilled in the art.

inor changes may be made without departing from the spirit-and scope of the invention as claimed.

What I lclaim asne'w is:

1. In afhot air furnace,a fire: ot, an outer drum on the fire pot,ran inner rum within and spaced from the outer drum,a vertical points or rooms through the air to said perforated tube and said band, a

casing surrounding the drums and forming a space above the latter to which heated air may pass from the space between the innerdrum and the magazine, pipes for conducting the heated air from the space above the drums, and means to conduct lair from the exterior of the outer drum to the lower part of, the .space between the inner drum and the magazlne.

2. In a hot air furnace, a fire pot, an outer drum on the fire pot, an inner drum within and spaced from the outer drum, a `vertical magazine within and spaced from the inner drum and projecting above the latter, an annular horizontal perforated tube closing the space between the lower ends of the inner drum and the magazine, means to conduct air from the exterior of the outer drum to said perforated tube, an annular hollow band on the outside of the fire pot, said fire pot having a series of openings communicating with said band, means to control the flow of air to said perforated tube and said band, acasingsurrounding the drums and forming a space above the latter to which heated air' may pass from the space between the inner drum and the magazine, ipes for conducting the heated air from t e space above the drums, and means to conduct air from the exterior of the outer drum to the lower art of the space between the inner drum an the magazine, the space between said drums being in communication with the interior of the lire pot, a smoke pipe communicating with the interior of the magazine, and an `annular tube abovethe drums and communicating with the smoke ipe, and the top of the space between the rums.

3. In a hot air furnace, a lire pot, an outer drum on the lire pot, an inner`.drum within and spaced from the outer drum, a. vertical magazine within and spaced from the inner drum and projecting above the latter, an an nular horizontalperforated tube closing the space between the lower ends of the inner drum and the magazine, means to conduct air from the exterior of the outer drum to said perfo] ated tube, an annular hollow band on the outside of the fire pot, said fire pot having a series of openings communicating with said band, means to control the flow of air to said perforated tube and said band, a casing surrounding the drums and forming a space above the latter to which heated air may pass from the space between the inner drum and the magazine, pipes for conducth ing the heated air from the space above the drums, and means to conduct air from the exterior of the outer drum to the lower art of the space between the inner drum an the magazine, an ash pit under the fire pot, and vertical tubes connecting the upper part of the-magazine with said ash pit.

4. In a hot air furnace, a fire pot, an outer drum on the [ire pot, an inner drum within and spaced from the outer drum, a. vertical magazine within and spaced from the inner drum and projecting above the latter, an annular horizontal perforated tube closing the space between the lower ends of the inner drum and the magazine, means to conduct air from the exterior of the outer drum to` said perforated tube, an annular hollow band on the outside of the fire pot, said fire' pot having a series of openings communicating with said eband, means to control the flow of air to said perforated tube and said band, a casing surrounding the drums and forming a space above the latter to which heated air Imay pass from the space between the inner drum and the magazine, pipes for conducting the heated air from the space above the drums, and means to conduct air from the exterior of the outer drum to the lower part of the space between the inner drum and the magazine, and damper controlled means for admitting airfrom the exterior of the outer drum to the interior of the magazine below the tops of the drums and above the annular perforated tube.

In testimony whereof I ailix my signature.

FRANK H. CARSON. 

